Open Access

The free life-sciences database that indexes preprints and peer-reviewed papers side by side.

The chemistry preprint server.

The large multidisciplinary preprint platform.

The vetted directory of trustworthy open-access journals — the antidote to predatory publishing.

The open infrastructure for citation data.

The free, authoritative index for education research.

The community-curated index of philosophy.

The free, authoritative front end to the world’s biomedical literature.

The free chemistry database from the NIH.

The umbrella platform behind many disciplinary preprint servers.